Laravel - 檢索直接/間接數據透視表訂戶

Question

我很難找到laravel;對於用戶的關係，我們有2個透視表：

一個用戶可以訂閱一個問題：

question_subscriber 
id question_id subscriber_id 
1  2   3 
2  2   4 
3  3   1 
4  3   2 

一個用戶可以訂閱用戶：有問題的業主

user_subscriber 
id user_id subscriber_id 
1  1   6 
2  1   7 
3  2   1 

普通問表：

questions 
id question user_id 
1  abc?  1 
2  xyz?  1 
3  123?  2 

主軸關係在他們的mod中正確設置ELS，我可以拉出來在foreach，對一個問題的用戶，$question->subscribersQuestion as $subscriber，或者用戶對用戶，$user->subscribersUser as $subscriber：

但如何才能拔出所有的用戶屬於用戶（直接或間接（通過他們擁有的問題））？

例如，這些應該是user 1檢索到的所有用戶：

6 // subscribed to directly 
7 // subscribed to directly 
3 // subscribed to through question 
4 // subscribed to through question 

任何想法的最有效的方式在Laravel做到這一點？

Answer 1

這將是最簡單的方法：

// assuming this setup: 
User hasMany Question 
User belongsToMany User (subscribers - direct) 
Question belongsToMany User (subscribers - indirect) 

// we don't need this, since we pass it by reference to the closure, 
// but for clarity let's initialize this variable: 
$indirectSubscribers = null; 

$user = User::with(['questions.subscribers' => function ($q) use (&$indirectSubscribers) { 
    // get all indirect subscribers (cost of additional query) 
    $indirectSubscribers = $q->get()->unique(); 
}])->find($userId); 

// merge with directs subscribers 
$allSubscribers = $user->subscribers->merge($indirectSubscribers);